Run dartfmt on all files under runtime.

runtime/lib/stopwatch_patch.dart

Index: runtime/lib/stopwatch_patch.dart
diff --git a/runtime/lib/stopwatch_patch.dart b/runtime/lib/stopwatch_patch.dart
index 2560243aab0cdc02e8243b62d94c95f7dcc00089..f87bc046b7556c1798f35b04e6a8083fc76d4f53 100644
--- a/runtime/lib/stopwatch_patch.dart
+++ b/runtime/lib/stopwatch_patch.dart
@@ -4,15 +4,18 @@
 
 // A VM patch of the stopwatch part of dart:core.
 
-@patch class Stopwatch {
-  @patch static void _initTicker() {
+@patch
+class Stopwatch {
+  @patch
+  static void _initTicker() {
     if (_frequency == null) {
       _frequency = _computeFrequency();
     }
   }
 
   // Returns the current clock tick.
-  @patch static int _now() native "Stopwatch_now";
+  @patch
+  static int _now() native "Stopwatch_now";
 
   // Returns the frequency of clock ticks in Hz.
   static int _computeFrequency() native "Stopwatch_frequency";